Hmmm... I don't own at SSR, and have no plans in being at WDW for this "Magical Event"

. With that said, I would be seriously ticked if I was an owner, staying at my home resort for the first time, and was shut out of my home resort feature pool during my first stay.
Maybe it's not logical, but I don't equate closing this pool for a private function to closing SAB. SAB was built by Disney for use by hotels completely owned and operated by Disney. When DVD built BCVs, they agreed to pay for rights to use the pool. It seems to me that the argument can be made that it is a Disney Resort pool, not a DVD/
DVC pool. High Rock Springs was built at a site that is currently a completely DVD/DVC resort. If I had to hazard a guess, I would think that the cost of building and maintaining the pool is being completely paid for by the original points costs and MFs paid by those who have purchased interests in SSR. Also, when SAB has been closed during our stay, the option to pool hop to Luna Pool has always been available, with shuttle service (a golf cart!) if desired.
Someone argued semantics about whether you own or don't own. The bottom line is that the POS promises the pool as part of your ownership (they call it ownership, by the way). Unlike Spa Services, restaurant discounts, ticket discounts, etc..., use of the feature pool is guaranteed and can't be taken away. I wouldn't accept losing the feature pool and not being given another one to use during the time that my pool was unavailable.
ROFL... if I was staying at SSR during MH, and I was locked out of my home pool for a publicity event, I might be tempted to post some protest signs in my windows... maybe march my kids around the perimeter of the pool with sad faces and signs that say: "I'm not having a "Magical Moment" - Mom and Dad bought into SSR, and I can't even use the lousy pool during our visit"... it might turn into a very different PR Event than the one they have in mind!
